<template>
  <view @click="back" @longpress="isPop = true">
    <swiper class="swiper-img" :current="currentImg" :duration="300" @change="changeSwiper">
      <swiper-item class="swiper-item" v-for="(item, index) in imgs" :key="index">
        <view class="img-page">
          <movable-area scale-area>
            <movable-view direction="all" scale="true" scale-min="1" scale-max="4">
              <image :src="item.url" mode="widthFix" :lazy-load="true" />
            </movable-view>
          </movable-area>
        </view>
      </swiper-item>
    </swiper>
    <view class="item-bottom">
      <view class="small-list-page">
        <view class="small-list" v-if="imgs.length > 1">
          <view class="img-page" :class="currentImg == index ? 'img-page-checked' : ''" v-for="(item, index) in imgs"
            :key="index" @click.stop="toImg(index)">
            <image class="img" border-radius="10rpx" :src="item" mode="aspectFill" />
          </view>
        </view>
      </view>
    </view>
    <view class="pop" v-if="isPop">
<!--      <view class="item" @click.stop="share()">分享图片</view> -->
      <!-- #ifndef H5 -->
      <view class="item" @click.stop="saveImg(false)">保存图片</view>
      <view class="item" @click.stop="saveImg(true)">保存全部图片</view>
      <!-- #endif -->
    </view>
  </view>
</template>

<script>
  export default {
    data() {
      return {
        imgs: [],
        currentImg: 0,
        isPop: false
      };
    },
    onLoad(options) {
      let {
        imgs,
        current
      } = options;
      this.imgs = JSON.parse(imgs);
      this.currentImg = 0;
    },
    methods: {
      changeSwiper(e) {
        this.currentImg = e.detail.current;
      },
      toImg(index) {
        this.currentImg = index;
      },
      back() {
        if (this.isPop) {
          this.isPop = false
          return
        }
        try {
          this.$Router.back(1);
        } catch (e) {
          //TODO handle the exception
          uni.navigateBack();
        }
      },
      share() {
        uni.downloadFile({
          // 下面一行时拼接预览PDF的地址！！！
          url: this.imgs[this.currentImg],
          success: function(res) {
            var filePath = res.tempFilePath;
            if (!filePath) return
            uni.openDocument({
              filePath: filePath,
              success: function(res) {
                console.log(res);
                console.log('打开文档成功');
              }
            });
          }
        });
      },
      saveImg(isAll = false) {
        const that = this;
        if (!isAll) {
          uni.downloadFile({
            url: this.imgs[this.currentImg],
            success: res => {
              if (res.statusCode === 200) {
                uni.saveImageToPhotosAlbum({
                  filePath: res.tempFilePath,
                  success: function() {
                    uni.showToast({
                      icon: "none",
                      title: "保存成功"
                    })
                    that.isPop =false
                  },
                  fail: function() {}
                });
              } else {}
            }
          });
          return;
        }
        this.imgs.forEach(item => {
          uni.downloadFile({
            url: item,
            success: res => {
              if (res.statusCode === 200) {
                uni.saveImageToPhotosAlbum({
                  filePath: res.tempFilePath,
                  success: function() {
                    uni.showToast({
                      icon: "none",
                      title: "保存全部成功"
                    })
                    that.isPop =false
                  },
                  fail: function() {}
                });
              } else {}
            }
          });
        })

      }
    },
  };
</script>

<style lang="scss" scoped>
  movable-view {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 100%;
    height: 100%;
  }

  movable-area {
    height: 100%;
    width: 100%;
    position: fixed;
    overflow: hidden;
  }

  movable-view image {
    width: 100%;
  }

  uni-image>img {
    z-index: -1 !important;
  }

  .content {
    height: 60vh;
  }

  .swiper-img {
    width: 100vw;
    height: 100vh;
    background-color: #ffffff;

    &>.swiper-item {
      width: 100vw;
      height: 100vh;
	  

      .img-page {
        height: 100vh;
        display: flex;
        align-items: center;
		
      }
    }
  }

  .item-bottom {
    width: 100vw;
    position: fixed;
    z-index: 9999;
    bottom: 0;
    left: 0rpx;
    padding: 30rpx;
    transition: ease-in-out 0.3s;
    height: 200rpx;
    display: flex;
    justify-content: space-between;
    flex-direction: column;
  }

  .small-list-page {
    min-height: 60rpx;
  }

  .small-list {
    display: flex;
    justify-content: center;
    align-items: center;

    .img-page {
      display: inline-block;
      margin-right: 20rpx;
      border: 2rpx solid #c2c2c2;
      transition: ease-in 0.1s;
      border-radius: 11rpx;
      background: #c2c2c2;
      overflow: hidden;

      &:last-child {
        margin-right: 0;
      }

      .img {
        width: 46rpx;
        height: 46rpx;
        display: block;
      }
    }

    .img-page-checked {
      transform: scale(1.2);
      border: 4rpx solid #c2c2c2;
    }
  }

  .pop {
    width: 500rpx;
    background-color: #FFFFFF;
    border-radius: 20rpx;
    overflow: hidden;
    position: fixed;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    z-index: 999999;

    .item {
      line-height: 100rpx;
      height: 100rpx;
      padding: 0 50rpx;
      transition: all .2s;
      border-radius: 20rpx;

      &:active {
        background-color: #eeeeee;
      }
    }
  }
</style>
